You know that feeling u get in ur stomach when u see police lights in ur rear view mirror? I've been getting that feeling very frequently the last few days, but not as intense. Its beginning to really worry me. Can anybody please give me some ideas to what is causing this and how I can fix it? It happens for no reason usually when i'm exhaling. I have had some anxiety lately, and have been weight training about 4 days/wk. I'm 21/male.